Scooby-Doo and The Ghoul School (1988)

Part of a series of Hanna-Barbera TV movies created in the late 80s, it featured popular franchises like Scooby-Doo, Yogi Bear and The Jetsons.
Scooby Doo and the gang visited a haunted school. After the girls are kidnapped, it's up to Scooby and the gang to save them.
This movie is still available on DVD and Video